BITHLO — Fearful that loud music and offensive language will again be broadcast through their neighborhood, some residents are urging Orange County officials to stop an outdoor concert set for Saturday at a nearby racetrack.

''We just don't want any more concerts out here,'' said resident Colleen Swain, a member of the Bithlo Betterment Committee, a citizen's group formed two years ago to upgrade the community.

The Southern Rock concert, which is being advertised on WDIZ-FM (100.3), is scheduled to start at 1 p.m at Orlando Speedworld on State Road 50. It will feature Greg Allman, Molly Hatchet, Stranger and Critical Mass.

Several residents of the east Orange community said they have been inconvenienced enough by concerts at the racetrack. They have asked the county to prohibit Saturday's event, charging that promoters do not have the necessary permit for an outdoor concert.

Promoter Bill Bracket said the event is properly permitted in conjunction with an auto race planned for Saturday. He said the concert will be part of the grand finale of the track racing season.

County Attorney Harry Stewart said officials would try to determine today if the concert was permitted after checking with Bracket and the track owners. If the concert is not permitted, Stewart said, promoters would have until Saturday to meet necessary requirements to get an outdoor concert permit, including providing medical services, security and restrooms. If they are unable to get a permit before the day of the concert, Stewart said the county would seek an injunction to prohibit it.

The race track just west of State Road 520 has

been ''a continuous thorn in the side of Bithlo residents,'' said Gary Atwood, who has lived there for 15 years.

Residents have repeatedly complained to the county that noise from the races has made life miserable.

''When they start those jet cars up, your house shakes, your dishes rattle, it's like an earthquake,'' said Swain, who lives two blocks from the track.

Residents sucessfully petitioned the county a few years ago to force the the track to close by 11 p.m. But they said some events continue after that.

Concerts and wet T-shirt contests have been as much a problem as the auto races, residents said. Music and profanity from the announcers often can be heard miles away, they said.

''The last time they had one we had to bring the kids in because it just got so raunchy,'' Swain said.

Residents said they have not worried much about outdoor concerts since the county adopted an ordinance in 1971 to regulate the events.

When they heard the advertisements for the Southern Rock concert on the radio, the residents said they became concerned they were in for more disruption.

''They promised us no more concerts and then we hear about this one on WDIZ,'' Atwood said.